Bit-holder extension



J. PERKINS, JR. 'BIT HOLDER EXTENSION.

APPLICATION FILED MAII.1I, I92o.

Patented. Feb@ 7, 1922,

ATTORNEY ula-Vrai)v STATI-:s

' JONATIIAN rEnxrNs, JR., or sAN DIEGO, CALIFORNIA.

f "Brr-HOLDER EXTENSION. e

To @All fwlwmt muy.con?mehr:y *Y e p ,Be it known that I, JoNA'rHAN PERKINS,

v J r., a citizen ofthe United States, residing at San Diego, in the county of Span Diego and State of California, have invented a certain new andv useful Bit-Holder Extension, vof which the4 following is a specification.

invention relates to an extension `mem-l ber for holding bits and ltheilikejand the objectsof my invention are: First, to provide abit holder extension which is so constructed'that it is ofy a minimum diameter so that it will enterthe holey behindfthe bit when the bit is of small diameter; second,

to provide a bit holder extension of this class in which the bit will beheld securely and Y several views of the drawings. 1

.The main hollow member 1, rod 2, nut 3,

will not loosen; third,lto provide a device of this class in which the means for holding the bit engaging members is supported by a nut at the opposite end, forming apart of the extension shank; fourth, to provide a device of this class in which the bit is readily secured and maybe readily removed, and

fifth, to provide a device of this class whichy is simple and economical of construction, durable, easy to operate, efficient in its action and which will not readily `deteriorate or get out of order. l

With these and other objects in View as will appear hereinafter, my invention consists of certain novel features of construction, combination and arrangement of parts and portions as will be hereinafter described in detail and particularly set forth in thek appended claim, reference being had to the accompanying drawings and to the charac ters of reference thereon which form apar of this application, in which:

Figure 1 is a longitudinal sectional view of the device, showing a portion of the clamp members and bit stock in elevation; Fig. 2 is a side elevational view at a 'right angle to that fof Fig. 1 minus thebit stock; Fig. 3 is a sectional View through 3 3 ofl Fig. 1; Fig. 4 is a sectional View through 4-4 of Fig. 1; Fig. 5 is a sectional view through 5-5`of Fig. 1 and Fig. 6 is a sectional view through 6--6 of Fig. 1. v

Similar characters of reference refer to similar parts and portions throughout the clamping members 4 and 5 pin 6, spring 7 and spring 8 constitute the principal partsV and portions of mybit holder extension.l

* 'speeic'ationiof Letters Patent.

pivotall shank and receive another one.

fatented fFeb. 7., 1192712.

nlipiiatioiimea Marcil 11, i920. yserial N6. 364,892.

inainv hollowinemberl provided'.V with a longitudinal hole 1a, in which the rodV .2 is adapted Vto fit and provided with sufficientv clearance'to permit its ready removal. It is provided on one end! with a shank por-i ytion lb, which yis of the conventional form, exce lt that'it is approximately one-half the usua length, the other one-half being suprod 2. On the opposite end of the mainv hollow member 1 is provided an enlarged portion 1c which is also provided with an enlarged internal recess ld, in which is mounted a compression spring 7, which resti against the shoulders 1" at its one end and this ro 2 are the clamp'membersi and 5, by means of alpin extending through a hole in the end of the member 2 and the opposite end of the spring 7 rests against the v pliedby*` means of a nut 3, which conforms -to the mounted on the opposite end of ends of the clamp members 4, thus tending to hold thev clamp members outwardly at all timesso that when the nut 3 is released the' spring 7 tends to thrust the clamp members `out ofthe end of the portion 1"'.V This portion lcis provided with oppositely disposed diverging walled slots 1f, which conform to angles on the outer surface of the clam -members 4, so that when the clamp mem ers are drawn into the member by means of the nut 3 on the end of the rodA age the corners of the bit as shown best i 1n Figs. 4 and 5 but are shaped to conform to the round portion of the bit shank near the 'outer ends as shown best in Fig.l 3 of the drawings. Mountedbetween the shank members is a compression spring 8, tending to hold them apart so that when said shank members are moved outwardly this spring 8 gradually spreads the Shank members apart so that they are ready to release the Vbit VThoughl have shown and described a particular construction, combination and arrangement of parts and portions I do not wish to be limited to this particular construction, combination and arrangement but vention the construction, combination and arrangement substantially as set forth in the'v appended claim. l.

It is obvious that with this construction there is provided a bit holder extension in which the shank of rthe bit is clamped between two clamping. members by being pressedinto the inclined surface slots in the one end of the main supporting memben That the clampingy members are mounted in VVslots so that-they can not turnandvthe nut on the end of the rod isvpositioned in the end of the bit driver so that-it can not turn vso that the bit can not loosen nor any of the parts move so that the bit will loosen while operating, that/the construction is such that the largery part of the extension maybe made of small diameter so that saidextension may be used'in a small-hole following the bit. I'

Having thus described my` inventionv what ing a continuation of said tapering squareV supporting Vmember, and both forming a conventional tapered square shank for the conventional bit driver, a pair of oppositely disposed clamping members engaging in clined inner' surfaces of said main bit lmember, whereby 'theyg are clamped 'together' when vmoved inwardly. e,

In'testimonywhereof, I have hereunto set my hand at San Diego, California this 2nd day of March, 1920.

JONATHAN PERKrN-sn.' 

